Pump shaft seal for hand oilers



NOV. 27, 1956 R mc o JR 2,772,034

PUMP SHAFT SEAL FOR HAND OILEZRS Filed Aug. 6, 195a INVENTOR. ROY H. RICHMOND JR.

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' ATTORNEYS.

United States Patent PUMP SHAFT SEAL FOR HAND OILERS Roy H. Richmond, Jr., Welisburg, W. Va., assignor to Eagle Manufacturing Company, Wellsburg, W. Va., a corporation of West Virginia Application August 6, 1953, Serial No. 372,747 4 Claims. (Cl. 222341) This invention is directed to improvements in seals for the pump shafts of hand oilers. In a manner to be described, the improved pump shaft seal of this invention is in the nature of a rubber grommet of a particular configuration which facilitates assembly of the pumping apparatus and which provides both a seal and a guiding support for the oiler pump shaft.

The hand oilers for which the seal of this invention is provided are the type in which a closure cap for an oil container mounts an oil delivery spout and a pumping apparatus for pumping oil from the container to the spout. The pumping apparatus includes a manually operable trigger which effects a reciprocating movement of a pump shaft extending through an opening in the top or closure for the container. To prevent leakage of oil from the container through the pump shaft opening, it is necessary to provide a seal about'the periphery of the pump shaft and the seal must allow limited lateral movement of the pump shaft since its reciprocating motion is not truly rectilinear.

Conventional seals for the pump shafts of hand oilers have heretofore been comprised of felt washers secured to the container top about the opening through which the pump shaft extends. This form of seal has not proved entirely satisfactory since wear incident to reciprocation of the pump shaft and compression of the sealing material by the lateral movement of the pump shaft during reciprocation have resulted in a deterioration of its scaling function. A further disadvantage of this type of seal is encountered in assembly of the seal and pump shaft with respect to the container top.

One of the principal objects of this invention is to provide an improved seal for hand oiler pump shafts which will both facilitate assembly of the shaft and seal with respect to the container top and provide an improved sealing action. To this end, the seal comprises a rubber grommet which may be mounted on the pump shaft prior to insertion of the pump shaft through the opening in the container top and which may thereafter be readily assembled with respect to the container top by forcing it through the container top pump shaft opening. When mounted in position, the grommet is effectively secured against movement relative to the container top and has sealing engagement with the surface of the oiler pump shaft.

Other objects and advantages of the invention will become apparent from the following description.

In the drawings there is shown a preferred embodiment of the invention. In this showing:

Fig. l is a vertical sectional view of a hand oiler showing the pumping apparatus and the seal of this invention in side elevation;

Fig. 2 is a top plan view of the apparatus shown in Fig. 1;

Fig. 3 is an enlarged elevational view of the grommet seal shown in Fig. 1;

Fig. 4 is a plan view of the seal shown in Fig. 3;

' L pump shaft 6. Upward movement of the shaft 6 raises ice Fig. 5 is a sectional view taken vertically of Fig. 3; and

Fig. 6 is a fragmentary detail sectional view illustrating '7 the relative positions of the seal and pump shaft with respect to the container top.

In the drawings, the numeral 1 designates a container having a cap or closure member 2 detachably secured toits upper end. A pumping unit designated as a whole by the numeral 3 is mounted on the cap 2 and comprises a spout 4 secured to and extending through an opening in the cap 2 and connected with a pumping unit 5 ar the pump unit 5 in a conventional manner to deliver a charge of oil to the spout 7, and the pump vent has a spring biased movement ina downward direction which pulls the shaft 6 downwardly when the trigger is released.

- Due to the fact that the trigger end 7b moves in an armor permitted by the seal about the shaft in the cap open-p ing. The parts thus far referred to are conventional and form no part per se of this invention.

- As indicated above, this invent-ion is directed to an improved construction of a seal -8 which seals the shaft 6 in the cap opening through which it extends. The seal 8 is in the formofa grommet fabricated from rubber, either natural or synthetic, or any other material having similar compressible and resilient characteristics. As best shown in Figs. 3, 4 and 5, the seal 8 comprises a rubber body '9 having an axially extending and tapered opening 10, the maximum diameter :of the opening 10 being slightly less than the diameter of the shaft6 so that its surface has a sliding liquid sealing engagement with the surface of the shaft 6. The diameter of the upper end of the opening 10 is slightly larger than the diameter of its lower end whereby the surface 11 defining such opening has a taper which converges axially toward its lower end. The outer surface of the body 9 is provided with an annular groove 12 spaced downwardly from its upper end 13. The portion 14 of the outer surface of the :body 9 below the groove 12 has a taper which converges in a downward direction to its lower end.

As best shown in Fig. 6, the opening in the cap 2 through which the shaft 6 extends has an inturned or depending lip 15 the lower edge'16 of which is normal to the plane of the cap .2 and substantially parallel to the shaft 6. The diameter of the lip 15 at its lower edge 16 is approximately the same as the external diameter of the grommet 8 at its lower end 17 to facilitate entry of the grommet in a manner to be described, and is slightly smaller than the external diameter of the body 9 at the inner surface of the groove 12 so that the lip 15 will have sealing engagement with such inner surface when positioned in the cap as shown in Fig. 6. Since the diameter of the body 9 at the inner surface of the groove 12 is slightly larger than the diameter of the lip 15, the body of the rubber grommet 8 will be compressed to provide a liquid seal by engagement of the lip 15 with the inner surface of the groove 12 when the grommet is in its assembled position. In addition, the axial depth of the lip 15 is slightly greater than the axial depth of the groove 12 so that the upper and lower surfaces of Patented Nov. 27, 1956' the groove 12. have sealing. engagement respectively with the upper surfacetof. the cap land the lip edge 16.

In the assembly of the cap and pumping apparatus as shown in Fig. 1,,the lower end of the shaft 6 is first insorted through the; opening min the" grommet andg'the grommet 'is' then forced downwardly through the cap operring'defined'byrthei lipi15: The taperedsurface 114 oh the being substantially the same as the diameter of said lipped closure opening to facilitate axialmcvement of said. body 7 to a mounted positioninsaid opening, said cap closure having its lipped periphery defining the opening therein grommet facilitates its downward movement through this] 7 opening, and when the groove 12' is moved to anaxiaLposition'roppositeithe'hp 15, thetrubberrin the body 9-.which wilkhave beeucompressed during its downward movement will expandsothat the lip 15 will have sealing engagement.

in the groove '12 amexplainedabove. In the mounting of 'the grommet 8 in ,thi'srmanner; it; will benoted that i the dependingrand curved shape of" the lip 15rcooperates with thefslopingilexterion surface .14 to facilitate moye-r.

mentof'the grommetto its mountedpositiom Attention is also. directed to the fact; that the depending arrangement of thelip. I presentstatflat surface tothe inner surface of the groove 12.and thus protects the grommetagainst cutting byrthematerialrof the cap. a

7 Attention is also directed to the fact that the downwardly convergingnsurface 11 of the opening 'lfl'provid'es an -improved sealing action against the surface of the,

shaft6.- The lower end of'the opening 1 0 by reason of its relatively smaller diameter has tighter engagement with'the surface of the shaft 6 and thus wipes oil from the'surface of the shaft during upward movement, and, 7

during downward movement of the shaft 6, any oil which may have' penetrated into theopening will tend to move downwardly with the shaft 6. ,By reason of the taper of' the opening 10 together with the snug engagement of 'the lip with the'surfaces of the groove'12, upward tmovemento'f the shaft 6 through theopening 10 -wil1tend to compress and'wedge-thebody'9 in the opening lfland increase its sealing engagement with the shaft 6,;while downwardrnovement of the shafto will stretch the rubber of the body 9 and relieve'suchfsealing engagement; The-- engagement of the lip- 15in the groove 12' provides an effective seal for the grommet and shaft with respect to the cap 2 which prevents Ieakage'of the =contents of the container throughthe opening defined by the 13 115. T he lip 15 not only has tight-engagement with the inner surface "of, the groove-12 but has ttightengagement with the upper and lower surfaces of such groove since the'axial' depth of the lipIS is slightly larger than the axial depth qf'the-groove 1- 2}. r 7 V t While I have illustrated and-described a preferred em bodiment of my invention, 'itwill be understood that this is merely by wag of illustration and that various; changes and modifications may be made therein within'jthe con-j ternpla-tion ,of the'invention and under the -scope"of the following claims. r

iclaim: r 1; The combination with a cap closure o'f a hand oiler having an. opening thereinrprovided with an in-turned lip and rapump shaft rleciprocable through-said opening, of

a seal'oomprising *arubber body having an annular groove in its outer surface for reception of the in-turned 'lip of the cap opening, the 'inner'diameter of said groove being slightlyiarger than the dia meter of said cap closure. lipped t 'opening,-'the outer surface'of saidbody having a downwardly converging taper from a maximum diameter at the lower ed e of'said groove to aminirnum diameterat the 'b ottomiof said body and with said minimum diameter of greater axial depth than that of said groove and posigagement with the surface of saidflbody openingv 2. In a hand oil'er havinga container, a delivery spout, I a pump in said container, and a reciprocablepump shaft for operating said pump to deliver oil from said container to said spout, the combination comprisinga cap closure V for said container, said closure having an opening therein through which said shaft extends and an integral inwardly projecting and depending lip about said opening, saidlj'p havingalower portion providing an inwardly facingQflat annular surface concentric to the axis of said opening, a seal comprising a rubberrbody having an 3 111 311 gIOQV in its outer surface, said lip being positioned'in saidi grgQve with its fiat annular s rface in sealing. eng gement wlith-v thesurface of said body at the inner boundary of. Said groovcrsaifd lip. havingfan' axial, depth igreater than h axial depth of saidgroove Wher'eby iits. lower. edge has seal ing engagement with the. body, surface definingthe lower edge of said. groove and the upper surface,- or saidclosure Y memhler'hasr sealing rengagernentrwith bodysurfaoe defining me peredgeer said groove, said ibody'having anv axialiyaextendingiopening the'surface of i'which has 7 V sliding iiquidsealing engagement-with the Surface. ofsaid f tshaftrnfl' r 3. The invention defined in clairn 2 characterized bysaid body having (an outer surface portion-below said groove has a taper converging axially downwatdly tofacilitatemounting offsaid bodyinrsaid closure opening, said surface; tapering fromi-a maximum diameter at '7 the lower edge of saidgroove to aminimum ndiameter at the lower edge of said bodyand with said ameter being substantially the same size as the smallest im r-em a er na 4. The invention defined in iclaim; 2 .characte ifigbyy the axial-1y extending opening in said-body having a taper which converges downwardly from a mairimum diammlf r at the upper ends-of said body to .a diameter-at therlpwer end of said body and with {the maximum ameter of said opening beingzslightly Jessthan'tthe div-H ameter of said shaft said shaft extending thrmigh said bodyopening and having sliding engagement with the surface of said-b yiop e References Cited in the are of this patent V PATENTS" 2,277,637 Eby Mar.;24,--1942- 2590928 DelMar a at. Dec; 11,194; 2,529,486 ,Clarksonetal. 'Nov.'14, 19.5( 2,592,949 Philipson Apr: 15,4952" 2,647,774 Newberry Aug. 4, 1953;

2 ,693,899" Trout 

